Pleasingly, as the baby sinks lower and the head engages with the rim of the cervix (or pelvis or pelmet), the medical bods have a way of measuring the descent, in fifths. So as the major circumference of the head settles, it is progressively one-, two-, three- and four-fifths engaged.
Except some midwifery teams use the inverse scale: three-fifths, for example, meaning only two-fifths in the slot with three to go.
It's not so much that you know, it's that you know so much that it ain't so...
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